Java Database Connectivity (JDBC)

Hi,

I have following code. I am using MySql database. and Tomcat server and MySql jdbc driver. I am able to get the Datasource but when I call getConnection on ds, I get Connection object as null. Any help here?

			ctx = new InitialContext();
			if( ctx == null ) throw new Exception("ERROR - No Context");

			//**************************//
			// ESTABLISH THE DataSource //
			//**************************//
						ds = (DataSource)ctx.lookup("java:comp/env/jdbc/xmediaDB");
			if( ds == null ) throw new Exception("ERROR - DataSource is null");

			//**************************//
			// ESTABLISH THE Connection //
			//**************************//
			con = ds.getConnection();
			if( con == null ) throw new Exception("ERROR - Failed to get connection");